Air Conditioning - Effects of opening doors

Is there any website that can determine the effects of opening and closing outside doors on keeping a house cool.

I live in small house with a 2 year old A/C, I work from home all the time and during the school year I almost never notice it getting hot inside the house, but then I am the only one there and it really hasn't started summer yet.
During the summer if we go out from about 6 to 11, it is usually very cool in the house when we return, but sometimes it is pretty warm and I think this is related to the doors beeing constantly opened and closed while we are gone and the teenage son is home.
Anybody know of any site that explains the effects of doors being opened and keeping a house cool and maybe other factors as well, the desktop with 21" monitor in my bedroom seems to heat the room up a couple of degrees.

I'm sure there is a site somewhere. But where who knows? It is a fact each time a door is opened cool air rushes out the lower part while hot air comes in the top to take its place.

There are way too many variables for a generalized chart to exist.

If an airconditioner is used properly it would be turned on at the start of the cooling season and then left on continuously.
Once a house has acclimatized, it would not take a lot of cooling power to recover from the reasonable opening and closing of doors.

When an airconditioner is sized, the occupancy of a house must be taken into account.
If your unit cannot maintain temperature from the door opening and closing, it is likely undersized, or in need of some serious maintenance.

It would likely be a good time for a maintanance tune-up on your a/c.

That is probably the problem "reasonable door opening".
My kids don't understand this, the doors are opened multiple times an hour, plus the front door is left open many times with only the glass storm door .

The only time kids need to come inside is to use the bathroom or if you call them for lunch or dinner. If they come inside to take a break, then they should stay for a while. A plastic water pitcher and cups can be placed outdoors. Lunch can be served outdoors as well. All outdoor toys can be set outside when they go out in the morning and brought back indoors at the end of the day. If you have a garage, these can be stored there.

If kids are old enough to run in and out and play outdoors, then they are old enough to learn about energy conservation. With less than five percent of the world’s population, we consume about one fourth of the world’s energy resources. Heating and cooling systems use more energy than any other systems in our homes.

In the summer, keep drapes and curtains closed on the sunny side of the house. Using ceiling fans in the summer allows you to raise the thermostat temperature, reducing the workload of your air conditioner.

Air conditioning systems do more than just cool the air. They lower humidity. Opening doors allows warm, humid air enter the home. The more your home seals out heat and humidity, the more efficiently your system will do its job. Insulation, weather-stripping, window coverings and shade trees are a few things that can be used to help your home beat the heat.

Setting the thermostat lower than usual will not produce more or colder air. It's best to leave the thermostat alone while the system is running. Constantly setting the control up or down might waste significant amounts of energy.

Air conditioning units ideally are placed on the shady side of the house where they don't have to work so hard. The wrong size air conditioner will use more electricity and increase your energy bills; make sure you have the right size. Depending on the size of your home, you can save 3% on your cooling costs for every degree you raise your thermostat in the summer. Raising the thermostat from 73 to 78 degrees can mean savings of up to 15% in cooling costs. Change the air conditioner’s air filter monthly during heavy use.

Check humidity in rooms with hygrometer. Humidity level should be between 35-55%. Use dehumidifier if humidity is too high.

Light colors on exterior of home can reflect sunlight and heat and keep interior cooler. Shade trees can reduce cooling costs by as much as 30%.

On hot summer days, the temperature in your attic can reach 150 degrees. Improving the ventilation in your attic will lower the temperature of the entire house and make your air conditioner’s job a lot easier. A thermostatically controlled attic fan can be installed to exhaust hot air.